Supporters of Vermont Sen. Bernie Sanders chanted as delegates entered the security perimeter for the Wells Fargo Center in Philadelphia on the first day of the Democratic National Convention Monday. (Tom Williams/CQ Roll Call)

The Bernie Delegates Network announced at their Tuesday morning meeting that they had found a "genuine progressive" alternative to Virginia Sen. Tim Kaine who had been willing to be nominated for vice president.

But the group would not release the name because it was "moot," said co-founder Jeff Cohen. The network was unable to obtain the necessary forms from the Democratic National Committee in time to put his or her name into nomination.